Object Just Black in Shading Tab?
It's most likely an issue with the shading mode. There are several ways to preview objects in Blender: wireframe, solid, shaded, textured, etc. Try clicking around on these:



Also, in your screenshot, you're in "World" editor mode (in the Shader editor). Make sure your world background isn't pure black/set to 0. If you don't have any lights in the scene, this is the only thing lighting it, and if it's set to 0 or pure black then there is no lighting at all, hence everything is black.